Radeon RX 6800 vs Radeon RX 6900 XT

Intro

Compare those specifications to the Radeon RX 6900 XT, which has a core clock speed of 1825 MHz and a GDDR6 memory frequency of 2000 MHz. It also uses a 256-bit bus, and uses a 7 nm design. It is made up of 5120 SPUs, 320 Texture Address Units, and 128 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6800		250 Watts
Radeon RX 6900 XT		300 Watts
	Difference: 50 Watts (20%)

Memory Bandwidth

Both cards have exactly the same memory bandwidth, so in theory they should have identical performance. (explain)

Texel Rate

The Radeon RX 6900 XT should be much (about 43%) better at texture filtering than the Radeon RX 6800. (explain)

Radeon RX 6900 XT		584000 Mtexels/sec
Radeon RX 6800		408000 Mtexels/sec
	Difference: 176000 (43%)

Pixel Rate

The Radeon RX 6900 XT should be much (about 43%) faster with regards to AA than the Radeon RX 6800, and also capable of handling higher resolutions without slowing down too much. (explain)

Radeon RX 6900 XT		233600 Mpixels/sec
Radeon RX 6800		163200 Mpixels/sec
	Difference: 70400 (43%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the maximum amount of information (measured in megabytes per second) that can be transferred over the external memory interface in one second. The number is worked out by multiplying the card's interface width by its memory speed. If it uses DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.